v3.3.0

• Add option for searching numbers in item list and tray menu
• Use exception instead of return code for exportData()/importData()
• Draw icon shadow (for internal icon font)
• Remove support for Qt 4, require Qt >= 5.1.0
• Fix storing only non-empty clipboard items
• Fix opening web browser from script with open()
• Fix exiting clipboard provider process when not needed
• Fix exportData()/importData() with relative file paths
• Fix SVG app icon resolution in some panels
• Fix closing window after a menu is closed and window is unfocused
• Fix icons for command error notifications
• Fix warnings when using system icons
• Linux: Fixes for AppData, desktop and flatpak files
• OSX: Fix pasting items
• OSX: Log errors when global shortcut registration fails